- #1

- 78

- 0

2. Fk-Mk*n

3. i know there are 4 forces acting on the object. gravity, normal force from the wall, kinetic friction, and the force that i applied. but i do not know how to set up the equation to solve this problem

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- Thread starter xstetsonx
- Start date

- #1

- 78

- 0

2. Fk-Mk*n

3. i know there are 4 forces acting on the object. gravity, normal force from the wall, kinetic friction, and the force that i applied. but i do not know how to set up the equation to solve this problem

- #2

- 38

- 0

Do you know how to draw a free body diagram?

- #3

- 78

- 0

- #4

- 38

- 0

- #5

- 78

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o i am sorry this question some how expected us to find the coefficient of kinetic friction on wood which is 0.2. and yes

- #6

tiny-tim

Science Advisor

Homework Helper

- 25,836

- 252

Hi xstetsonx! Welcome to PF!

i need to know the F to get the normal force right?

No, you don't need to

For constant speed, you need zero acceleration, which means zero net force in both the x and y direction.

So call the force F, find N, and then find µN.

- #7

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so the total force will be

mK*Fcos49-mg+Fsin49?

mK*Fcos49-mg+Fsin49?

- #8

tiny-tim

Science Advisor

Homework Helper

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so the total force will be

mK*Fcos49-mg+Fsin49?

Yes, except I'm not sure about that m at the beginning.

- #9

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[tex]F_{app} - F_{k} - mg\sin(\theta) = 0[/tex]

[tex]n - mg\cos(\theta) = 0[/tex]

The algebra's up to you.

Edit:

so the total force will be

mK*Fcos48-mg+Fsin48?

Yes, that's correct, assuming F is the force of gravity.

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